55613778 has 24 divisors (see below), whose sum is σ = 122259984. Its totient is φ = 16852440.

The previous prime is 55613773. The next prime is 55613797. The reversal of 55613778 is 87731655.

It is not an unprimeable number, because it can be changed into a prime (55613773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37576 + ... + 39027.

It is an arithmetic number, because the mean of its divisors is an integer number (5094166).

Almost surely, 2^55613778 is an apocalyptic number.

55613778 is an abundant number, since it is smaller than the sum of its proper divisors (66646206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55613778 is a wasteful number, since it uses less digits than its factorization.

55613778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76630 (or 76619 counting only the distinct ones).

The product of its digits is 176400, while the sum is 42.

The square root of 55613778 is about 7457.4645825508. The cubic root of 55613778 is about 381.7046637694.

It can be divided in two parts, 5561 and 3778, that added together give a palindrome (9339).

The spelling of 55613778 in words is "fifty-five million, six hundred thirteen thousand, seven hundred seventy-eight".